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Students who lived in dormitories without air conditioning (AC) during a heat wave performed worse on a series of cognitive tests compared with students who lived in air-conditioned dorms, according to new research led by Harvard T.H Chan School of Public Health. The field study, the first to demonstrate the detrimental cognitive effects of indoor temperatures during a heat wave in a group of young healthy individuals, highlights the need for sustainable design solutions in mitigating the health impacts of extreme heat.

Students who lived in dormitories without air conditioning (AC) during a heat wave performed worse on a series of cognitive tests compared with students who lived in air-conditioned dorms, according to new research led by Harvard T.H Chan School of Public Health. The field study, the first to demonstrate the detrimental cognitive effects of indoor temperatures during a heat wave in a group of young healthy individuals, highlights the need for sustainable design solutions in mitigating the health impacts of extreme heat.

“Most of the research on the health effects of heat has been done in vulnerable populations, such as the elderly, creating the perception that the general population is not at risk from heat waves,” said Jose Guillermo Cedeño-Laurent, research fellow at Harvard Chan School and lead author of the study. “To address this blind spot, we studied healthy students living in dorms as a natural intervention during a heat wave in Boston. Knowing what the risks are across different populations is critical considering that in many cities, such as Boston, the number of heat waves is projected to increase due to climate change.”

The study will be published online July 10, 2018 in PLOS Medicine as part of a special issue dedicated to climate change and health.

Extreme heat can have severe consequences for public health and is the leading cause of death of all meteorological phenomena in the U.S. Temperatures around the world are rising, with 2016 marking the warmest year on record for the past two centuries. While the health impacts of extreme heat are well documented, most studies to date have focused on vulnerable populations, including the very young or the elderly, and tend to be epidemiologic studies that use outdoor temperature records. Understanding the effects of indoor temperatures is important given that adults in the U.S. spend 90% of their time indoors.